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本文对云南的几个基性——超基性岩提出可能系阿拉斯加型侵入体的问题,作了比较性的论述。首先介绍了阿拉斯加型基性——超基性岩的一般特征,对不同类型的侵入体(阿拉斯加型环状侵入体、阿尔卑斯型侵入体、层状侵入体)作了主要特征的比较;然后比较了景谷县半坡、金平县白马寨等岩体,认为接近阿拉斯加型。最后,对阿拉斯加型侵入体的地质——找矿意义作了讨论。指出,区分开阿拉斯加型和阿尔卑斯型两类基性——超基性岩,不但对认识该地区的构造格局、地质发展史、岩浆活动规律及其分布有指导意义,而且对成矿远景区划也起一定的指导作用,因为两者的成矿专属性有明显的差异。
In this paper, some basic-ultramafic rocks in Yunnan are proposed to be Alaska-type intrusions, making a comparative discussion. Firstly, the general characteristics of Alaskan-type mafic-ultramafic rocks are introduced, and the main characteristics of different types of invaders (Alaska-type ring intrusions, alpine intrusions and stratiform intrusions) are compared. Jingpo Banpo, Jinping Baimazhai and other rock, that close to Alaska type. Finally, the geological implications of the Alaskan-type invaders are discussed. It is pointed out that distinguishing two types of basic-ultramafic rocks, the Alaskan and Alpine types, not only has guiding significance for understanding the tectonic framework, geological history, magmatic activity and distribution in this area, Play a guiding role, because there is a clear difference between the two mineralization specificity.